Code Definition

P0649 — Cruise control lamp control circuit malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0649

P0649 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0649 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0649 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0649 is set when the Engine Control Module (ECM) detects a malfunction in the control circuit of the cruise control lamp. This lamp, typically found on the vehicle's dashboard, indicates the status of the cruise control system. It lights up when the cruise control is active or blinks when there is an issue with the system. A malfunction in this circuit suggests an electrical problem, such as an open or short circuit, that hinders the lamp's ability to function properly. This could lead to the lamp failing to illuminate, staying on continuously, or blinking erratically, thus fai...

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